The 2017–18 Liga Națională season was the 68th season of the Liga Națională, the highest professional basketball league in Romania. U-BT Cluj-Napoca were the defending champion.

The competition format will be the same as in the previous season.

• 12 teams played the regular season, consisting in a double-legged round robin format.
• At the end of the regular season, teams are split into two groups, one of them composed by the first six teams and the other one by the rest. In this second stage all points of the regular season are counted and the teams will face each other from its group twice.
• All teams from the group from 1st to 6th and the two first qualified teams from the bottom group will join the playoffs. In this knockout stage, quarterfinals and semifinals will be played with a best-of-three-games format and the final with a best-of-five one.

Timba Timișoara and Politehnica Iași promoted from the last Liga I. There were not any relegations as there were only 11 teams in the previous season and Olimpic Baia Mare withdrew from the competition.^[1]

Steaua
Dinamo

Mureș

Timba

Timișoara

Arges

Oradea

Sibiu

Phoenix

Politehnica

Craiova

U-BT

Location of teams in 2017–18 Liga Națională

All series were played in a best-of-five games format.